build: Add opencode tools for testing

.opencode/tools/ask262-search-spec-sections.ts

@@ -0,0 +1,43 @@
+/**
+ * OpenCode custom tool: ask262_search_spec_sections
+ * Searches the ECMAScript specification for relevant sections.
+ */
+
+import { tool } from "@opencode-ai/plugin";
+import * as lancedbSdk from "@lancedb/lancedb";
+import { OllamaEmbeddings } from "@langchain/ollama";
+import { createSearchSpecSectionsTool } from "../../src/agent-tools";
+
+export default tool({
+  description:
+    "Searches the ECMAScript specification for sections relevant to a query. " +
+    "Returns JSON array with sectionId, sectionTitle, score, partIndex, totalParts, and content. " +
+    "Use this when you need to find spec sections related to a JavaScript topic or question.",
+  args: {
+    query: tool.schema
+      .string()
+      .describe(
+        "The search query to find relevant specification sections (e.g., 'how does array map work')",
+      ),
+  },
+  async execute(args, context) {
+    const { query } = args;
+    const { worktree } = context;
+
+    // Initialize embeddings
+    const embeddings = new OllamaEmbeddings({
+      model: "qwen3-embedding:0.6b",
+    });
+
+    // Connect to LanceDB
+    const storageDir = `${worktree}/storage`;
+    const db = await lancedbSdk.connect(storageDir);
+    const table = await db.openTable("spec_vectors");
+
+    // Create and execute tool
+    const searchTool = createSearchSpecSectionsTool(table, embeddings);
+    const result = await searchTool.func({ query });
+
+    return result;
+  },
+});